Screw



FIG. 1 is a top view of a screw;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top perspective view thereof; and,

FIG. 6 is a bottom perspective view thereof. 

CLAIM The ornamental design for a screw, as shown. 